feat: enhance accessibility and testing with data-test attributes and improve error handling

packages/features/event-management/src/components/create-event-form.tsx

@@ -352,10 +352,19 @@ export function CreateEventForm({ accountId, account }: Props) {
         </Card>
 
         <div className="flex justify-end gap-2">
-          <Button type="button" variant="outline" onClick={() => router.back()}>
+          <Button
+            type="button"
+            variant="outline"
+            onClick={() => router.back()}
+            data-test="event-cancel-btn"
+          >
             Abbrechen
           </Button>
-          <Button type="submit" disabled={isPending}>
+          <Button
+            type="submit"
+            disabled={isPending}
+            data-test="event-submit-btn"
+          >
             {isPending ? 'Wird erstellt...' : 'Veranstaltung erstellen'}
           </Button>
         </div>